APA

Library of Congress, Library of Congress, . (2012). Library of Congress classification. A. General works. Washington, D.C: Library of Congress, Cataloging Distribution Service.

Chicago

Library of Congress, Library of Congress, . 2012. Library of Congress classification. A. General works. Washington, D.C: Library of Congress, Cataloging Distribution Service.

Harvard

Library of Congress, Library of Congress, . (2012). Library of Congress classification. A. General works. Washington, D.C: Library of Congress, Cataloging Distribution Service.

MLA

Library of Congress, Library of Congress, . Library of Congress classification. A. General works. Washington, D.C: Library of Congress, Cataloging Distribution Service. 2012.